Vencetmat 5mm Truss Rod Wrench, Allen Wrench Tool Ball End for Martin Acoustic Guitar Truss Rod Adjustment And Deep or Narrow Truss Adjustment. 5mm(Black) Color:5mm(Black) Has working voltage of 12

Has working voltage of 12 volt and are equipped with short circuit protection and memory function

3 knobs control: Volume/Tone/Gain

Control red

With strongest 3M adhesive backing and the 8mm width is easy to install in narrow places

95" (LW) Package content: 1 x 5mm Hexagonal Wrench

Vencetmat 5mm Truss Rod Wrench, Allen Wrench Tool Ball End for Martin Acoustic Guitar Truss Rod Adjustment And Deep or Narrow Truss Adjustment. 5mm(Black) Color:5mm(Black) Has working voltage of 12Vencetmat 5mm Truss Rod Wrench, Allen Wrench Tool Ball End for Martin Acoustic Guitar Truss Rod Adjustment And Deep or Narrow Truss Adjustment. Color: 5mm(Black) What is the most important thing to attention to when buying a wrench? 1. First of all, it must be a very accurate size, non standard size will bring irreparable damage to the adjusting screw. 2. Secondly, it must be strong and can be used for a long time. Inferior spanners can only be used